diff options
Diffstat (limited to 'drivers/clk/samsung/clk-s3c2410.c')
| -rw-r--r-- | drivers/clk/samsung/clk-s3c2410.c | 487 |
1 files changed, 487 insertions, 0 deletions
diff --git a/drivers/clk/samsung/clk-s3c2410.c b/drivers/clk/samsung/clk-s3c2410.c new file mode 100644 index 000000000000..140f4733c02e --- /dev/null +++ b/drivers/clk/samsung/clk-s3c2410.c @@ -0,0 +1,487 @@ +/* + * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Common Clock Framework support for S3C2410 and following SoCs. + */ + +#include <linux/clk.h> +#include <linux/clkdev.h> +#include <linux/clk-provider.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/syscore_ops.h> + +#include <dt-bindings/clock/s3c2410.h> + +#include "clk.h" +#include "clk-pll.h" + +#define LOCKTIME 0x00 +#define MPLLCON 0x04 +#define UPLLCON 0x08 +#define CLKCON 0x0c +#define CLKSLOW 0x10 +#define CLKDIVN 0x14 +#define CAMDIVN 0x18 + +/* the soc types */ +enum supported_socs { + S3C2410, + S3C2440, + S3C2442, +}; + +/* list of PLLs to be registered */ +enum s3c2410_plls { + mpll, upll, +}; + +static void __iomem *reg_base; + +#ifdef CONFIG_PM_SLEEP +static struct samsung_clk_reg_dump *s3c2410_save; + +/* + * list of controller registers to be saved and restored during a + * suspend/resume cycle. + */ +static unsigned long s3c2410_clk_regs[] __initdata = { + LOCKTIME, + MPLLCON, + UPLLCON, + CLKCON, + CLKSLOW, + CLKDIVN, + CAMDIVN, +}; + +static int s3c2410_clk_suspend(void) +{ + samsung_clk_save(reg_base, s3c2410_save, + ARRAY_SIZE(s3c2410_clk_regs)); + + return 0; +} + +static void s3c2410_clk_resume(void) +{ + samsung_clk_restore(reg_base, s3c2410_save, + ARRAY_SIZE(s3c2410_clk_regs)); +} + +static struct syscore_ops s3c2410_clk_syscore_ops = { + .suspend = s3c2410_clk_suspend, + .resume = s3c2410_clk_resume, +}; + +static void s3c2410_clk_sleep_init(void) +{ + s3c2410_save = samsung_clk_alloc_reg_dump(s3c2410_clk_regs, + ARRAY_SIZE(s3c2410_clk_regs)); + if (!s3c2410_save) { + pr_warn("%s: failed to allocate sleep save data, no sleep support!\n", + __func__); + return; + } + + register_syscore_ops(&s3c2410_clk_syscore_ops); + return; +} +#else +static void s3c2410_clk_sleep_init(void) {} +#endif + +PNAME(fclk_p) = { "mpll", "div_slow" }; + +struct samsung_mux_clock s3c2410_common_muxes[] __initdata = { + MUX(FCLK, "fclk", fclk_p, CLKSLOW, 4, 1), +}; + +static struct clk_div_table divslow_d[] = { + { .val = 0, .div = 1 }, + { .val = 1, .div = 2 }, + { .val = 2, .div = 4 }, + { .val = 3, .div = 6 }, + { .val = 4, .div = 8 }, + { .val = 5, .div = 10 }, + { .val = 6, .div = 12 }, + { .val = 7, .div = 14 }, + { /* sentinel */ }, +}; + +struct samsung_div_clock s3c2410_common_dividers[] __initdata = { + DIV_T(0, "div_slow", "xti", CLKSLOW, 0, 3, divslow_d), + DIV(PCLK, "pclk", "hclk", CLKDIVN, 0, 1), +}; + +struct samsung_gate_clock s3c2410_common_gates[] __initdata = { + GATE(PCLK_SPI, "spi", "pclk", CLKCON, 18, 0, 0), + GATE(PCLK_I2S, "i2s", "pclk", CLKCON, 17, 0, 0), + GATE(PCLK_I2C, "i2c", "pclk", CLKCON, 16, 0, 0), + GATE(PCLK_ADC, "adc", "pclk", CLKCON, 15, 0, 0), + GATE(PCLK_RTC, "rtc", "pclk", CLKCON, 14, 0, 0), + GATE(PCLK_GPIO, "gpio", "pclk", CLKCON, 13, CLK_IGNORE_UNUSED, 0), + GATE(PCLK_UART2, "uart2", "pclk", CLKCON, 12, 0, 0), + GATE(PCLK_UART1, "uart1", "pclk", CLKCON, 11, 0, 0), + GATE(PCLK_UART0, "uart0", "pclk", CLKCON, 10, 0, 0), + GATE(PCLK_SDI, "sdi", "pclk", CLKCON, 9, 0, 0), + GATE(PCLK_PWM, "pwm", "pclk", CLKCON, 8, 0, 0), + GATE(HCLK_USBD, "usb-device", "hclk", CLKCON, 7, 0, 0), + GATE(HCLK_USBH, "usb-host", "hclk", CLKCON, 6, 0, 0), + GATE(HCLK_LCD, "lcd", "hclk", CLKCON, 5, 0, 0), + GATE(HCLK_NAND, "nand", "hclk", CLKCON, 4, 0, 0), +}; + +/* should be added _after_ the soc-specific clocks are created */ +struct samsung_clock_alias s3c2410_common_aliases[] __initdata = { + ALIAS(PCLK_I2C, "s3c2410-i2c.0", "i2c"), + ALIAS(PCLK_ADC, NULL, "adc"), + ALIAS(PCLK_RTC, NULL, "rtc"), + ALIAS(PCLK_PWM, NULL, "timers"), + ALIAS(HCLK_LCD, NULL, "lcd"), + ALIAS(HCLK_USBD, NULL, "usb-device"), + ALIAS(HCLK_USBH, NULL, "usb-host"), + ALIAS(UCLK, NULL, "usb-bus-host"), + ALIAS(UCLK, NULL, "usb-bus-gadget"), + ALIAS(ARMCLK, NULL, "armclk"), + ALIAS(UCLK, NULL, "uclk"), + ALIAS(HCLK, NULL, "hclk"), + ALIAS(MPLL, NULL, "mpll"), + ALIAS(FCLK, NULL, "fclk"), + ALIAS(PCLK, NULL, "watchdog"), + ALIAS(PCLK_SDI, NULL, "sdi"), + ALIAS(HCLK_NAND, NULL, "nand"), + ALIAS(PCLK_I2S, NULL, "iis"), + ALIAS(PCLK_I2C, NULL, "i2c"), +}; + +/* S3C2410 specific clocks */ + +static struct samsung_pll_rate_table pll_s3c2410_12mhz_tbl[] __initdata = { + /* sorted in descending order */ + /* 2410A extras */ + PLL_35XX_RATE(270000000, 127, 1, 1), + PLL_35XX_RATE(268000000, 126, 1, 1), + PLL_35XX_RATE(266000000, 125, 1, 1), + PLL_35XX_RATE(226000000, 105, 1, 1), + PLL_35XX_RATE(210000000, 132, 2, 1), + /* 2410 common */ + PLL_35XX_RATE(203000000, 161, 3, 1), + PLL_35XX_RATE(192000000, 88, 1, 1), + PLL_35XX_RATE(186000000, 85, 1, 1), + PLL_35XX_RATE(180000000, 82, 1, 1), + PLL_35XX_RATE(170000000, 77, 1, 1), + PLL_35XX_RATE(158000000, 71, 1, 1), + PLL_35XX_RATE(152000000, 68, 1, 1), + PLL_35XX_RATE(147000000, 90, 2, 1), + PLL_35XX_RATE(135000000, 82, 2, 1), + PLL_35XX_RATE(124000000, 116, 1, 2), + PLL_35XX_RATE(118000000, 150, 2, 2), + PLL_35XX_RATE(113000000, 105, 1, 2), + PLL_35XX_RATE(101000000, 127, 2, 2), + PLL_35XX_RATE(90000000, 112, 2, 2), + PLL_35XX_RATE(85000000, 105, 2, 2), + PLL_35XX_RATE(79000000, 71, 1, 2), + PLL_35XX_RATE(68000000, 82, 2, 2), + PLL_35XX_RATE(56000000, 142, 2, 3), + PLL_35XX_RATE(48000000, 120, 2, 3), + PLL_35XX_RATE(51000000, 161, 3, 3), + PLL_35XX_RATE(45000000, 82, 1, 3), + PLL_35XX_RATE(34000000, 82, 2, 3), + { /* sentinel */ }, +}; + +static struct samsung_pll_clock s3c2410_plls[] __initdata = { + [mpll] = PLL(pll_s3c2410_mpll, MPLL, "mpll", "xti", + LOCKTIME, MPLLCON, NULL), + [upll] = PLL(pll_s3c2410_upll, UPLL, "upll", "xti", + LOCKTIME, UPLLCON, NULL), +}; + +struct samsung_div_clock s3c2410_dividers[] __initdata = { + DIV(HCLK, "hclk", "mpll", CLKDIVN, 1, 1), +}; + +struct samsung_fixed_factor_clock s3c2410_ffactor[] __initdata = { + /* + * armclk is directly supplied by the fclk, without + * switching possibility like on the s3c244x below. + */ + FFACTOR(ARMCLK, "armclk", "fclk", 1, 1, 0), + + /* uclk is fed from the unmodified upll */ + FFACTOR(UCLK, "uclk", "upll", 1, 1, 0), +}; + +struct samsung_clock_alias s3c2410_aliases[] __initdata = { + ALIAS(PCLK_UART0, "s3c2410-uart.0", "uart"), + ALIAS(PCLK_UART1, "s3c2410-uart.1", "uart"), + ALIAS(PCLK_UART2, "s3c2410-uart.2", "uart"), + ALIAS(PCLK_UART0, "s3c2410-uart.0", "clk_uart_baud0"), + ALIAS(PCLK_UART1, "s3c2410-uart.1", "clk_uart_baud0"), + ALIAS(PCLK_UART2, "s3c2410-uart.2", "clk_uart_baud0"), + ALIAS(UCLK, NULL, "clk_uart_baud1"), +}; + +/* S3C244x specific clocks */ + +static struct samsung_pll_rate_table pll_s3c244x_12mhz_tbl[] __initdata = { + /* sorted in descending order */ + PLL_35XX_RATE(400000000, 0x5c, 1, 1), + PLL_35XX_RATE(390000000, 0x7a, 2, 1), + PLL_35XX_RATE(380000000, 0x57, 1, 1), + PLL_35XX_RATE(370000000, 0xb1, 4, 1), + PLL_35XX_RATE(360000000, 0x70, 2, 1), + PLL_35XX_RATE(350000000, 0xa7, 4, 1), + PLL_35XX_RATE(340000000, 0x4d, 1, 1), + PLL_35XX_RATE(330000000, 0x66, 2, 1), + PLL_35XX_RATE(320000000, 0x98, 4, 1), + PLL_35XX_RATE(310000000, 0x93, 4, 1), + PLL_35XX_RATE(300000000, 0x75, 3, 1), + PLL_35XX_RATE(240000000, 0x70, 1, 2), + PLL_35XX_RATE(230000000, 0x6b, 1, 2), + PLL_35XX_RATE(220000000, 0x66, 1, 2), + PLL_35XX_RATE(210000000, 0x84, 2, 2), + PLL_35XX_RATE(200000000, 0x5c, 1, 2), + PLL_35XX_RATE(190000000, 0x57, 1, 2), + PLL_35XX_RATE(180000000, 0x70, 2, 2), + PLL_35XX_RATE(170000000, 0x4d, 1, 2), + PLL_35XX_RATE(160000000, 0x98, 4, 2), + PLL_35XX_RATE(150000000, 0x75, 3, 2), + PLL_35XX_RATE(120000000, 0x70, 1, 3), + PLL_35XX_RATE(110000000, 0x66, 1, 3), + PLL_35XX_RATE(100000000, 0x5c, 1, 3), + PLL_35XX_RATE(90000000, 0x70, 2, 3), + PLL_35XX_RATE(80000000, 0x98, 4, 3), + PLL_35XX_RATE(75000000, 0x75, 3, 3), + { /* sentinel */ }, +}; + +static struct samsung_pll_clock s3c244x_common_plls[] __initdata = { + [mpll] = PLL(pll_s3c2440_mpll, MPLL, "mpll", "xti", + LOCKTIME, MPLLCON, NULL), + [upll] = PLL(pll_s3c2410_upll, UPLL, "upll", "xti", + LOCKTIME, UPLLCON, NULL), +}; + +PNAME(hclk_p) = { "fclk", "div_hclk_2", "div_hclk_4", "div_hclk_3" }; +PNAME(armclk_p) = { "fclk", "hclk" }; + +struct samsung_mux_clock s3c244x_common_muxes[] __initdata = { + MUX(HCLK, "hclk", hclk_p, CLKDIVN, 1, 2), + MUX(ARMCLK, "armclk", armclk_p, CAMDIVN, 12, 1), +}; + +struct samsung_fixed_factor_clock s3c244x_common_ffactor[] __initdata = { + FFACTOR(0, "div_hclk_2", "fclk", 1, 2, 0), + FFACTOR(0, "ff_cam", "div_cam", 2, 1, CLK_SET_RATE_PARENT), +}; + +static struct clk_div_table div_hclk_4_d[] = { + { .val = 0, .div = 4 }, + { .val = 1, .div = 8 }, + { /* sentinel */ }, +}; + +static struct clk_div_table div_hclk_3_d[] = { + { .val = 0, .div = 3 }, + { .val = 1, .div = 6 }, + { /* sentinel */ }, +}; + +struct samsung_div_clock s3c244x_common_dividers[] __initdata = { + DIV(UCLK, "uclk", "upll", CLKDIVN, 3, 1), + DIV(0, "div_hclk", "fclk", CLKDIVN, 1, 1), + DIV_T(0, "div_hclk_4", "fclk", CAMDIVN, 9, 1, div_hclk_4_d), + DIV_T(0, "div_hclk_3", "fclk", CAMDIVN, 8, 1, div_hclk_3_d), + DIV(0, "div_cam", "upll", CAMDIVN, 0, 3), +}; + +struct samsung_gate_clock s3c244x_common_gates[] __initdata = { + GATE(HCLK_CAM, "cam", "hclk", CLKCON, 19, 0, 0), +}; + +struct samsung_clock_alias s3c244x_common_aliases[] __initdata = { + ALIAS(PCLK_UART0, "s3c2440-uart.0", "uart"), + ALIAS(PCLK_UART1, "s3c2440-uart.1", "uart"), + ALIAS(PCLK_UART2, "s3c2440-uart.2", "uart"), + ALIAS(PCLK_UART0, "s3c2440-uart.0", "clk_uart_baud2"), + ALIAS(PCLK_UART1, "s3c2440-uart.1", "clk_uart_baud2"), + ALIAS(PCLK_UART2, "s3c2440-uart.2", "clk_uart_baud2"), + ALIAS(HCLK_CAM, NULL, "camif"), + ALIAS(CAMIF, NULL, "camif-upll"), +}; + +/* S3C2440 specific clocks */ + +PNAME(s3c2440_camif_p) = { "upll", "ff_cam" }; + +struct samsung_mux_clock s3c2440_muxes[] __initdata = { + MUX(CAMIF, "camif", s3c2440_camif_p, CAMDIVN, 4, 1), +}; + +struct samsung_gate_clock s3c2440_gates[] __initdata = { + GATE(PCLK_AC97, "ac97", "pclk", CLKCON, 20, 0, 0), +}; + +/* S3C2442 specific clocks */ + +struct samsung_fixed_factor_clock s3c2442_ffactor[] __initdata = { + FFACTOR(0, "upll_3", "upll", 1, 3, 0), +}; + +PNAME(s3c2442_camif_p) = { "upll", "ff_cam", "upll", "upll_3" }; + +struct samsung_mux_clock s3c2442_muxes[] __initdata = { + MUX(CAMIF, "camif", s3c2442_camif_p, CAMDIVN, 4, 2), +}; + +/* + * fixed rate clocks generated outside the soc + * Only necessary until the devicetree-move is complete + */ +#define XTI 1 +struct samsung_fixed_rate_clock s3c2410_common_frate_clks[] __initdata = { + FRATE(XTI, "xti", NULL, CLK_IS_ROOT, 0), +}; + +static void __init s3c2410_common_clk_register_fixed_ext( + struct samsung_clk_provider *ctx, + unsigned long xti_f) +{ + struct samsung_clock_alias xti_alias = ALIAS(XTI, NULL, "xtal"); + + s3c2410_common_frate_clks[0].fixed_rate = xti_f; + samsung_clk_register_fixed_rate(ctx, s3c2410_common_frate_clks, + ARRAY_SIZE(s3c2410_common_frate_clks)); + + samsung_clk_register_alias(ctx, &xti_alias, 1); +} + +void __init s3c2410_common_clk_init(struct device_node *np, unsigned long xti_f, + int current_soc, + void __iomem *base) +{ + struct samsung_clk_provider *ctx; + reg_base = base; + + if (np) { + reg_base = of_iomap(np, 0); + if (!reg_base) + panic("%s: failed to map registers\n", __func__); + } + + ctx = samsung_clk_init(np, reg_base, NR_CLKS); + if (!ctx) + panic("%s: unable to allocate context.\n", __func__); + + /* Register external clocks only in non-dt cases */ + if (!np) + s3c2410_common_clk_register_fixed_ext(ctx, xti_f); + + if (current_soc == S3C2410) { + if (_get_rate("xti") == 12 * MHZ) { + s3c2410_plls[mpll].rate_table = pll_s3c2410_12mhz_tbl; + s3c2410_plls[upll].rate_table = pll_s3c2410_12mhz_tbl; + } + + /* Register PLLs. */ + samsung_clk_register_pll(ctx, s3c2410_plls, + ARRAY_SIZE(s3c2410_plls), reg_base); + + } else { /* S3C2440, S3C2442 */ + if (_get_rate("xti") == 12 * MHZ) { + /* + * plls follow different calculation schemes, with the + * upll following the same scheme as the s3c2410 plls + */ + s3c244x_common_plls[mpll].rate_table = + pll_s3c244x_12mhz_tbl; + s3c244x_common_plls[upll].rate_table = + pll_s3c2410_12mhz_tbl; + } + + /* Register PLLs. */ + samsung_clk_register_pll(ctx, s3c244x_common_plls, + ARRAY_SIZE(s3c244x_common_plls), reg_base); + } + + /* Register common internal clocks. */ + samsung_clk_register_mux(ctx, s3c2410_common_muxes, + ARRAY_SIZE(s3c2410_common_muxes)); + samsung_clk_register_div(ctx, s3c2410_common_dividers, + ARRAY_SIZE(s3c2410_common_dividers)); + samsung_clk_register_gate(ctx, s3c2410_common_gates, + ARRAY_SIZE(s3c2410_common_gates)); + + if (current_soc == S3C2440 || current_soc == S3C2442) { + samsung_clk_register_div(ctx, s3c244x_common_dividers, + ARRAY_SIZE(s3c244x_common_dividers)); + samsung_clk_register_gate(ctx, s3c244x_common_gates, + ARRAY_SIZE(s3c244x_common_gates)); + samsung_clk_register_mux(ctx, s3c244x_common_muxes, + ARRAY_SIZE(s3c244x_common_muxes)); + samsung_clk_register_fixed_factor(ctx, s3c244x_common_ffactor, + ARRAY_SIZE(s3c244x_common_ffactor)); + } + + /* Register SoC-specific clocks. */ + switch (current_soc) { + case S3C2410: + samsung_clk_register_div(ctx, s3c2410_dividers, + ARRAY_SIZE(s3c2410_dividers)); + samsung_clk_register_fixed_factor(ctx, s3c2410_ffactor, + ARRAY_SIZE(s3c2410_ffactor)); + samsung_clk_register_alias(ctx, s3c2410_aliases, + ARRAY_SIZE(s3c2410_aliases)); + break; + case S3C2440: + samsung_clk_register_mux(ctx, s3c2440_muxes, + ARRAY_SIZE(s3c2440_muxes)); + samsung_clk_register_gate(ctx, s3c2440_gates, + ARRAY_SIZE(s3c2440_gates)); + break; + case S3C2442: + samsung_clk_register_mux(ctx, s3c2442_muxes, + ARRAY_SIZE(s3c2442_muxes)); + samsung_clk_register_fixed_factor(ctx, s3c2442_ffactor, + ARRAY_SIZE(s3c2442_ffactor)); + break; + } + + /* + * Register common aliases at the end, as some of the aliased clocks + * are SoC specific. + */ + samsung_clk_register_alias(ctx, s3c2410_common_aliases, + ARRAY_SIZE(s3c2410_common_aliases)); + + if (current_soc == S3C2440 || current_soc == S3C2442) { + samsung_clk_register_alias(ctx, s3c244x_common_aliases, + ARRAY_SIZE(s3c244x_common_aliases)); + } + + s3c2410_clk_sleep_init(); +} + +static void __init s3c2410_clk_init(struct device_node *np) +{ + s3c2410_common_clk_init(np, 0, S3C2410, 0); +} +CLK_OF_DECLARE(s3c2410_clk, "samsung,s3c2410-clock", s3c2410_clk_init); + +static void __init s3c2440_clk_init(struct device_node *np) +{ + s3c2410_common_clk_init(np, 0, S3C2440, 0); +} +CLK_OF_DECLARE(s3c2440_clk, "samsung,s3c2440-clock", s3c2440_clk_init); + +static void __init s3c2442_clk_init(struct device_node *np) +{ + s3c2410_common_clk_init(np, 0, S3C2442, 0); +} +CLK_OF_DECLARE(s3c2442_clk, "samsung,s3c2442-clock", s3c2442_clk_init); |